solve the equation: 2 tan theta - cot theta = -1
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2{tan(theta)}^2 -1=-tan(theta)
2{tan(theta)}^2+tan(theta)-1=0
by solving it.
tan(theta)=1/2,-1
theta=tan^-1(1/2) and theta =tan^-1(-1)
2{tan(theta)}^2+tan(theta)-1=0
by solving it.
tan(theta)=1/2,-1
theta=tan^-1(1/2) and theta =tan^-1(-1)
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